The WebKit engine was recently enhanced with the HttpOnly Cookie feature originally introduced in Internet Explorer. This is a security feature that restricts access to certain cookies making them only available for HTTP requests and not from JavaScript running within the browser; a feature originally developed to help with XSS attacks.
The next versions of Safari and Google Chrome will most likely include these updated bits completing the browser lineup as Internet Explorer, FireFox and Opera already have this feature implemented.
Nice to see innovation being accepted and implemented across the board.